Pressure-responsive burner nozzle



A. F. SCHUMANN PRESSURE-RESPONSIVE BURNER NOZZLE Aug. 15, 1950 Filed March '19 1946 INVENTOR. A L F/aso JcHuM/mw Patented Aug. 1950 PRESSURE-RESPONSIVE BURNER. NOZZLE zmfned Schumann, Lower to rHauck rManufacturing iThe invention relates-120a high; pressureiburner eapparatus ad-apted more I. especially to the comsbustion of liq-uid fuels -or finely powderedsolid It has for an object to provide a burner of this type wherein the pressure of the fuel atomizing medium is automatically maintained substantially uniform under varying conditions over a wide range of operation.

'A further object of the invention is to provide a burner of the aforesaid type which shall be of simple and rugged design and readily and inexpensively constructed.

In carrying out the invention, a suitable closed and elongated casing is provided which has an inlet for an atomizing medium and a circular axial orifice at one end for discharge of atomized fuel. At the other end of the casing a flexible diaphragm closes said casing, being located in the longitudinal axis thereof opposite said orifice.

A resilient means, such as a spring, bears against the diaphragm to bias it in a direction toward said orifice.

Extending axially through the casing, as well as through the diaphragm to which it is sealed for reciprocation therewith, is a tubular element for delivery of liquid fuel through its outer end in juxtaposition to the said orifice. The arrangement of the fuel outlet with respect to the said orifice is such, moreover, that an annular outlet is provided between its periphery and the juxtaposed end of the casing, and in a manner such that the cross-sectional area of the outlet will be varied in accordance with axial displacement of said tubular nozzle element.

At its opposite end, said nozzle element is adapted for connection to a suitable source of liquid, or powdered solid, fuel supply.

The nature of the invention, however, will best be understood when described in connection with the accompanying drawings, in which Fig. 1 is a front elevation of the novel burner.

Fig. 2 is a longitudinal section thereof.

Fig. 3 is a transverse section through the burner, taken on the line 3-3, Fig. 2, and looking in the direction of the arrows.

Referring to the drawings, ll] designates an elongated casing of generally cylindrical conformation and being extended by means of one or more sleeve portions, such as the intermediate sleeve II and the outlet sleeve I2. These sleeves are respectively threaded into position, and the outlet sleeve l2 has a circular, axially disposed orifice opening I3 at its extreme outer end, which opening cooperates with a tubular element, hereinafter more fully described, to constitute the outlet *ofiourner. The sleeveportion l'2engages a plurality of radially extending spacer pins" M of 'the tubular *elerri'ent to center properly the example, by means of a coiled spring 16 which is conveniently positioned by being held within a cap member I! secured through its flange 18 to a corresponding flange H3 at the rear of the casing 10. The cap is provided with a vent 19 to permit the diaphragm to vibrate freely in accordance with pressure applied to the orifice side of the diaphragm by the atomizing gas such as air or steam which may be introduced through the inlet connection 20 provided with control valve 2|, whereby the fiow of the atomizing gas may be regulated, as is well understood.

The tubular element, hereinbefore referred to, is indicated by its various tubular sections 25, 26 and 21 and the nozzle end 28, all axially assembled for continuous unobstructed passage therethrough of the liquid fuel. This is introduced at the end opposite the nozzle end 28, for example, through a hose connection 29, the tubular element at its section 26 passing through the diaphragm l5 and being fixedly secured thereto so that it may vibrate therewith under variations in atomizing gas pressure prevailing in casing H]. A satisfactory means of effecting this attachment of the section to the diaphragm is to bolt together two flanged rings mounted over the section 26 on opposite sides of the diaphragm which is perforated to receive the bolts. One ring abuts a shoulder 26 while the other engages with the inner end of the section 25 adjustably mounted over the outer end of section 26.

The tubular element is closed at nozzle end 28, as indicated at 35, save for a plurality of radial ports 36 to the periphery of the nozzle tip 31 which of frusto-conical contour designed to cooperate with the orifice l3 to provide an annular and variable burner outlet 38 therebetween. The cross-sectional area of this outlet will then depend on the axial displacement of the tubular element as controlled by diaphragm I5 in accordance with the pressure prevailing in casing It. For more effective distribution and atomization of fuel discharged by nozzle end 28, it is preferred to provide grooves 39 in the surface of tip 3'! over the respective ports, said grooves be 3 ing directed toward the discharge end of the burner.

I claim:

A burner for fiowable fuel, comprising an elongated casing affording a chamber having an inlet for atomizing medium, a tubular element extending longitudinally therefrom and terminating at its outer end in an axial orifice affording a valve seat, a flexible diaphragm extending transversely of the casing in advance of the inlet for atomizing medium to separate the chamber into two non-communicating compartments,

ate with the said orifice seat to afiord a variable annular orifice outlet in accordance with the axial displacement of the movable tubular element, said tip having circularly disposed, substantially radially directed ports from its interior to deliver fuel to the said annular orifice outlet, and said movable tubular element on the side of the diaphragm opposite to the atomizing inlet being adapted for connection to a source of fuel supply.

ALFRED F. SCHUMANN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 758,206 Grundell et a1 Apr. 26, 1904 1,188,830 Reese June 27, 1916 1,380,866 Day June 7, 1921 1,590,115- Nicholson June 22, 1926 1,716,325 Rogers June 4, 1929 2,303,925 Fisher Dec. 1, 1942 

